Bionanite Cloud

Bionanite Cloud CR 7

XP 3,200
N Fine construct (nanotech, swarm)
Init +8; Senses blindsense 60 ft., darkvision 60 ft., low-light vision; Perception +20


AC 22, touch 22, flat-footed 18 (+4 Dex, +8 size)
hp 71 (11d10+11)
Fort +3, Ref +9, Will +9
Defensive Abilities swarm traits; Immune construct traits, weapon damage; Resist fire 10


Speed fly 40 ft. (perfect)
Melee swarm +14 (3d6 plus distraction and weakness)
Space 10 ft.; Reach 0 ft.
Special Attacks distraction (DC 15), fascination, reconstructive healing


During Combat Once the bionanite cloud notices “defective androids” (i.e., any living humanoids), it surges up to pacify them. The cloud does not seek to kill these defects and does not damage foes who have fallen unconscious through damage or poisoning.


Str 1, Dex 18, Con —, Int 6, Wis 18, Cha 10
Base Atk +11; CMB —; CMD
Feats Ability Focus (distraction), Improved Initiative, Iron Will, Lightning Reflexes, Skill Focus (Perception), Toughness
Skills Fly +24, Perception +20
Languages Aklo


Fascination (Ex)

As a standard action, a bionanite cloud can create a series of hypnotic waves of color to fascinate creatures within 30 feet. The distraction of a nearby combat or other dangers prevents this ability from working, but otherwise, all affected creatures must succeed at a DC 19 Will save or become fascinated. The bionanite cloud can maintain this effect each round after initial activation as a move action. This is a visual mind-affecting effect. The save DC is Dexterity-based.

Reconstructive Healing (Ex)

As a swift action, a bionanite cloud can heal a single living target it shares a space with, healing 1d6 points of damage. The cloud often triggers this ability when it reduces a creature to negative hit points, so as to stabilize the target. The cloud can administer this healing in an instant before resolving any actual damage dealt to prevent a creature’s death from its swarm attack.

Weakness (Ex)

When a bionanite cloud damages a living creature, it disrupts the transmission of nerve impulses to the creature’s muscles, causing 1d4 points of Strength damage. A successful DC 15 Fortitude save negates this Strength damage, but a creature that is nauseated takes a –4 penalty on this saving throw. The save DC is Constitution-based.


Environment any urban
Organization solitary or pair
Treasure incidental

This swirling cloud of reflective particles shimmers with a cascade of refracted rainbow light as it floats and swirls in midair.

Appearing as a shimmering and sometimes colorful curtain of light, a bionanite cloud is more a natural disaster in numbers than a monster to be defeated. Better to be avoided than confronted. Created by artificers who produce synthetic humanoid creatures like androids, it is essentially a nanotechnological antibody intended to seek out impurities in the community and eradicate them.

Section 15: Copyright Notice

Mechanical Monsters © 2023, Legendary Games; Authors: Jason Nelson, Tom Phillips, Mike D. Welham, Matt Goodall, Alex Riggs, Matt Daley.

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